There are many places to visit in Cornwall; gardens, wildlife parks and sanctuaries, cinemas, art centers, pubs and restaurants. You can play in the large tenpin bowling center, go kart with all weather karting for all ages, play paintball and simulated combat for fun. There are also events such as fetes, fairs, dog shows, firework displays, exhibitions and anything else that will make your stay enjoyable. This place is amazing. Hope my family could spend a vacation here someday.
If you are in England and do not want to spend much time overseas, then may be you can take it easy on weekends in Cornwall.